[HELP] Sensitivity analysis

回答済み

Evans Etrue Howard

2021年03月22日 14:17

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I have successfully solved this MIP in Gurobi. I tried performing a sensitivity analysis on the results but I get getting these errors:

print(mo.getAttr(GRB.Attr.Pi))

GurobiError: Unable to retrieve attribute 'Pi'

and 

print(mo.getAttr(GRB.Attr.RC))

GurobiError: Unable to retrieve attribute 'RC'

 

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• 正式なコメント

  

  Simranjit Kaur

  • Gurobi Staff

  2025年06月23日 02:57 編集済み

  This post is more than three years old. Some information may not be up to date. For current information, please check the Gurobi Documentation or Knowledge Base. If you need more help, please create a new post in the community forum. Or why not try our AI Gurobot?.
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  Jaromił Najman

  • Gurobi Staff

  2021年03月22日 14:30

  RC is a variable attribute and Pi is a constraint attribute. Thus, you have to access those via the particular objects, see getAttr() and Python Attribute Examples.

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  Evans Etrue Howard

  2021年03月22日 15:30

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  I tried and I still got this error message

   

  print(mo.getAttr("Pi", mo.getConstrs()))

   

  ---------------------------------------------------------------------------
  GurobiError                               Traceback (most recent call last)
  <ipython-input-57-aeeada5b4371> in <module>
  ----> 1 print(mo.getAttr("Pi", mo.getConstrs()))
  
  src\gurobipy\model.pxi in gurobipy.Model.getAttr()
  
  src\gurobipy\attrutil.pxi in gurobipy.__gettypedattrlist()
  
  GurobiError: Unable to retrieve attribute 'Pi'

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  Jaromił Najman

  • Gurobi Staff

  2021年03月22日 19:03

  The Pi attribute is only available for continuous problems, cf. the documentation. For MIPs, see How do I retrieve the (dual) Pi values for a MIP problem?

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